Cyclostrema, Adeorbis, Yitrinella, and related genera. 125 



pi. xviii, figs. 32-34, 1853), should undoubtedly be referred to 

 Vitriyiella rather than to Ethalia as given by Mr. Dall (Bull. M. C. 

 Z., xviii, p. 361, 1889). 



Section Circvilus Jeffrej-s, 1865. See page 110. 

 Adeorhis Wood, 1842, in part. 

 \ Type, Circulus striatus (Philippi) Pilsbry. 



AdeorMs striatus Wood, Ann. Mag. Nat. Hist, ix, p. 530, pi. v, figs. 5-6, 1842; 

 Mon. Crag. Moll., p. 137, pi. xv, fig. 7, 1848 =Valvata? striata Philippi (teste Wood). 



Circulus Duminyi Jeffreys, B. C, iii, p. 315, 1865 ; v, p. 203, pi. Ixii, f. 5. 1869 = 

 Solarium Philippii Oantraine (teste Je'ffreys). 



Circulus striatus Pilsbry, Tryon's Manual, xi, p. 274, pi. 66, figs. 12, 13, 1889. (A 

 very complete synonymy is given.) 



Plate XXIII. fig. 11. 



Mr, Dall has very kindly loaned me specimens of Duminyi from 

 both Naples and the coast of France, in the U. S. National Museum. 



They resemble the smaller species, the liratus of our coast, in hav- 

 ing the upper part of the whorls covered with raised spiral threads 

 separated by grooves, but the grooves are less deeph^ cut, making 

 the alternating threads less elevated. The whorls are less swollen or 

 convex, the suture shallower, the nuclear whorl, although of about 

 the same size, is less elevated, causing the shell to appear lower and 

 flatter, with a flatter base, a feature which increases with age. 



The sculpture on the series of specimens from the coast of France 

 is even less conspicuous than that on the single larger specimen from 

 Naples. 



Circulus liratus (Verrill). 



Omalaxis (?) lirata Verrill, these Trans., v, p. 529, 1882. 



Skenea lirata Verrill, op. cit., vi, p. 452, 1885. Bush, op. cit., vi, p. 464, 1885. 

 Adeorhis supranitidus, var. OrUgnyi Dall, Bull. Mus. Comp. Zool., xviii, p. 278, 

 1889; Bull. U. S. Nat. Mus., No. 37, p. 150, 1889, in part. 



Skenea lirata Bush, BuU. Mus. Comp. Zool., xxiii, p. 240, pi. i, figs. 11, 12, 1893. 



Plate XXIII. figs. 7, 12-12&. 



Found in considerable numbers off Cape Hatteras, N. C, in 8-43 

 fathoms, 1883-1884. 



This species is considered by Mr. Dall to be the same as Fischer's 

 A. Orhignyi from the West Indies. That, however, is a very minute 

 species (diam. 1^"""; height 1™™), ornamented, "with 12-15 elevate, 

 acute, equidistant, concentric costae," while the larger species, liratus 

 (diam. 2|™'"; height, about 1"""), has but 9 or 10 cinguli or lirae. 



